Pull-socket



UNITED. sTATEs PATENT OFFICE.

' GEORGE B. THOMAS .AND CARL ERIC ANDERSON, OF BRIDGEPORT, CONNECTICUT,

ASSIGNORS T THE BRYANT ELECTRIC COMPANY, OF BRIDGEPORT, CONNECTI- CUT, .A CORPORATION OF CONNECTICUT. y

PULL-SOCKET.

Specification of Letters Patent.

Patented Mar. 9, 1920.

Application filed August 25, 1914. Serial No. 858,532.

f Tov all whom t may concern y Be it' known that we, GEORGE B. THoMAs and CARL ERIC ANDERSON, both citizens ot the United States oAnierica, residing'in the city of Bridgeport, in the county ot' Fairlield and State of Connecticut, have invented certain new and useful Improvements in Pull-Sockets, .of which the following is a specification.v f

Our invention relates to pull sockets and particularly to the switch mechanism there- 0fthe object of our invention being to provide a switch device adapted to effect a quick double make and break of the socket circuit, with a wide parting between-the switch terminals and switch plate whereby a relatively heavy current may be safely broken. i

In the accompanying drawing,

Figure 1 is a vertical section through a pull-socket in which our invention is einbodied in one form;

Fig. 2 is a dropped perspective of certain ofthe elements off the' switch mechanism;

Fig. 3 is`a similar view of the actuating ratchet and associated parts;

Fig. 4 is. a plan of the upper button;

Fig. 5 is an inverted plan of the socket with the shell removed;

Fig. 6 is a plan of the lower insulating button;

Fig. Z is an inverted plan of the upper button; f

Fig. 8 is a detached perspective of one of the wire terminals and its associated switch terminal; and

\ F ig. 9 is an inverted perspective of the operating plate shown in Fig. 3.

The present switch mechanism. is here shown mounted in a pull socket, the insulating body of which comprises an upper button A\and a lower button B mounted as usual within a casing comprising a cap 10, shell 11 and insulating lining 124within into the switch chamber where' its end 2O forms one of the switch terminals engaged' nals 2O and 22, the current is led from the "wire terminal 25 to the center contact 18,

while in its other position at right angles to that shown in Fig. l, the center contact circuit is broken at each end of the switch bar 21. The double break thus secured is very wide and a relatively heavy current.

can he safely broken by the switch.

The mechanism for Operating the switch bar 21 comprises an escapement mechanism mounted on the spindle 26. The stop plate 27 with four stop shoulders 28 is here shown riveted to a base plate 29 having downwardly extending lugs 3() which take into recesses 31 in the button B, thus holding the stop plate 27 stationary. The spindle 26 passes down through a'central perforation 132 the stop plate into a socket 33 in the button B. Mounted on the spindle 26 we provide a cam 34 bearing within the cani plate 35. The latter is provided with a downwardly-extending stop lug 361 adapted y to cperate with the shoulders 28 of the stop plate 27 and an upwardly extending lug 37 which slides in the,-slot 38 of the switchbar 21, the latter in normal position lying ahovefthe cam 34 on the switch spindle 26. The switch spring 39 is coiled upon the spindle 26andfis provided at its lower end with a loop 40 which engages the lug 41 struck up from the switch bar. A second loop 42 at the upper end of the switch spring engages one of the downwardlyv struck lugs 43, on the star plate 44. A disk 45 isrigidly mounted upon the spindle 26 in like manner as the cam 34 by means of a radial slot 46 passed through tangential slots 4701i opposite sides of the spindle and swaged tightly in position. Through peripheral notches 48 in this disk the lugs 43 on the star plate 44 project downwardly into position ,in which they may be engaged by the loop 42 of the switch spring. lt is thus obvious that both the disk 45v andthe star plate 44 rotate with the switch spindle 26.` Radial arms 49 on `the star plate '44 are engaged by the dogs -a hole 58 in the flange of the socket bearing 59 for the u'pper end of the spindle 26. Inasmuch as this flange, which is noncircular, is seated in a recess G0 of like shape, it is held normally against rotation. It may be depressed out of this recess, however,

and turned in either direction 'toladjust the' tension of the spring 55, after which it is again seated in its recess. t

The operation of the switch will be readily understood. Upon a pull of the chain 61 through the chain guide 62 the operating plate 52 is moved in a direction toA effect engagement, between the dogs 50 on the ratchet 51 and the arms 49 on the star plate 44. nasinuch as the latter is rigid with the spindle 26, the latter is rotated. The spring 39 is simultaneously placed under tension by its engagement with the lugs 43 since the lower end of the spring engages the switch bar 21 which is held stationary by reason of the engagement of the lug 36 on the cam plate with one of the stop shoulders 28. As the spindle rotates, however, the cam 34 thereon forces the cam plate 35 outward, thus freeing the lug 86 from the shoulder 28 and permitting it to rotate with the switch bar. As it rotates, however, the cam plate is drawn inward by reason of the shape of vtheam 34 and the lug 36 engages the succeeding shoulder 28, thereby halting the switch Ybar after a 'quarter revolution thereof. The switch `bar\having thusitaken its on or ofi' position, as ythe case may be, the pull chain 61 is released and the operating plate is returned by the spring to its original position ready to again operate the switch.

Various modifications of construction will readily suggest themselves and we do not limit our invent-ion to the details shown.

We claim as our inventionz* l. In an electric switch, a switch spindle, an actuating ratchet plate oscillating thereon, a marginally notched washer fast on the spindle, a star plate having radial arms adapted to cooperate with the dogs of the ratchet plate, and offset fingers adapted to engage the notches; of the washer on the spindle, in combination with a spring tensioned by the rotation of said parts.

2. In an electric switch, a switch spindle, a switch bar freely journaled thereon, and comprising a strap having its ends offset to form contact wings, the body of said bar being slotted at one side of its axis of rota tion, and having a lug struck therefrom on the opposite side of said axis of rotation, a switch spring coiled on the spindle and engaging said lug on the switch bar, in combination with a catch plate freely surroundingl the spindle and having a lug offset into engagement with the slot in the switch bar, a stop vlug offset in the opposite direction, a serrated stop plate engaging the stop lug, and a cam fast on the spindle and engaging the catch plate and serving on the rotation of the spindle to free the stop lug of the catch plate from the serrated stop plate, sub stantially as described.

3. In an electric lamp socket, an insulating button pierced on, opposite sides of the axis of the socket, a center contact having an offset arm projecting through one of said holes in the button, a switch terminal projecting through the other hole in said button, a wire terminal electrically connected to said switchfterminal, and a rotary switch bar adapted to make and break connection between the center contact arm and switch terminal, substantially as described.

In testimony whereof we have signed our names to this specificationl inthe'presenceI of two subscribing witnesses.

GEORGE B. THOMAS. CARL ERIC ANDERSON. Vitnesses H. M. WICHERT, G. W. Goonmoen. 

